\subsection{Grasp Task}
\label{grasp}

\subsubsection{Completion Time}
\label{grasp_tct}

On the time to complete a trial, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{13.6}, \pinf{0.001}, see \figref{results/Grasp-CompletionTime-Location-Overall-Means}) %
and Target (\anova{3}{3990}{18.8}, \pinf{0.001}).
%
Opposite was faster than Fingertips (\qty{+19}{\%}, \pinf{0.001}), Proximal (\qty{+13}{\%}, \pinf{0.001}), Wrist (\qty{+14}{\%}, \pinf{0.001}), and No Vibrations (\qty{+8}{\%}, \p{0.03}).
%
No Vibrations was faster than Fingertips (\qty{+11}{\%}, \pinf{0.001}).
%
SE was faster than NE (\pinf{0.001}), NW (\pinf{0.001}), and SW (\pinf{0.001});
%
and SW was faster than NE (\p{0.03}).


\subsubsection{Contacts}
\label{grasp_contacts_count}

On the number of contacts, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{15.1}, \pinf{0.001}, see \figref{results/Grasp-Contacts-Location-Overall-Means}) %
and Target (\anova{3}{3990}{7.6}, \pinf{0.001}).
%
Fewer contacts were made with Opposite than with Fingertips (\qty{-26}{\%}, \pinf{0.001}), Proximal (\qty{-17}{\%}, \pinf{0.001}), or Wrist (\qty{-12}{\%}, \p{0.002});
%
but more with Fingertips than with Wrist (\qty{+13}{\%}, \p{0.002}) or No Vibrations (\qty{+17}{\%}, \pinf{0.001}).
%
It was also easier on SW than on NE (\pinf{0.001}), NW (\p{0.006}), or SE (\p{0.03}).


\subsubsection{Time per Contact}
\label{grasp_time_per_contact}

On the mean time spent on each contact, there were two statistically significant effects: %
Positioning (\anova{4}{3990}{2.9}, \p{0.02}, see \figref{results/Grasp-TimePerContact-Location-Overall-Means}) %
and Target (\anova{3}{3990}{62.6}, \pinf{0.001}).
%
It was shorter with Fingertips than with Opposite (\qty{+7}{\%}, \p{0.01}).
%
It was also shorter on SE than on NE, NW or SW (\pinf{0.001});
%
but longer on SW than on NE or NW (\pinf{0.001}).


\subsubsection{Grip Aperture}
\label{grasp_grip_aperture}

On the average distance between the thumb's fingertip and the other fingertips during grasping, there were two
statistically significant effects: %
Positioning (\anova{4}{3990}{30.1}, \pinf{0.001}, see \figref{results/Grasp-GripAperture-Location-Overall-Means}) %
and Target (\anova{3}{3990}{19.9}, \pinf{0.001}).
%
It was longer with Fingertips than with Proximal (\pinf{0.001}), Wrist (\pinf{0.001}), Opposite (\pinf{0.001}), or No Vibrations (\pinf{0.001});
%
and longer with Proximal than with Wrist (\pinf{0.001}) or No Vibrations (\pinf{0.001}).
%
But, it was shorter with NE than with NW or SW (\pinf{0.001});
%
and shorter with SE than with NW or SW (\pinf{0.001}).